Motor Circuit Protectors
Motor Circuit Protectors (MPCBs) for Industrial Motor Protection
Motor circuit protectors (MPCBs) are compact protective devices used in industrial motor control systems to provide manual disconnect capability along with protection against short circuits and overload conditions. These devices are commonly installed in motor control centers (MCCs) and industrial control panels where dependable motor protection and serviceability are essential.
In many automation systems, an MPCB is installed upstream of a contactor or motor starter to protect the motor branch circuit. By combining switching capability with protective functions, MPCBs simplify panel design while providing reliable motor protection. Selecting the correct motor circuit protector requires matching the adjustable current range to the motor’s full-load current (FLA), verifying the number of poles and voltage rating, and ensuring the interrupting capacity meets the application requirements.
Common applications
- Motor protection in MCC buckets and industrial control panels
- Pumps, compressors, and industrial fans
- Conveyors and material handling systems
- OEM machinery and industrial automation equipment
- Maintenance replacement and spare inventory planning
Motor Circuit Protector Series
Browse Allen-Bradley motor circuit protectors by product family to find compatible replacements for your installed motor control systems.
- Allen-Bradley 190 MPCBs – compact motor protection circuit breakers commonly used in MCCs and industrial control panels.
- Allen-Bradley 140M MPCBs – adjustable motor protection breakers designed for motor starter applications and control cabinets.
- Allen-Bradley 140U UL MPCBs – UL-focused motor circuit protectors designed for North American motor control applications.
- Allen-Bradley 140G High Capacity MPCBs – high-interrupting motor circuit protectors designed for demanding industrial systems.
Related categories
When replacing an existing motor circuit protector, confirm the motor full-load current, adjustable trip range, pole configuration, voltage rating, and interrupting capacity to ensure compatibility with the motor starter and control panel design.